Drill-grinder.



Patented Oct. 3|, I899.

A. C. GRUBER.

DRILL GRINDER.

{Application filed Jlily 14, 1899.)

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I NEED STATES PATENT Fries.

DRlLL-GRINDER.

SPECIFICATION forming part of Letters Patent N 0. 635,999, dated October31, 1899.

Application filed July 14,1899. Serial No. 723,798. (No model.)

To all whom it may concern.-

Be it known that I, ALBERT C. GRUBER, a citizen of the United States,residing at Warren, in the county of Warren and State of Pennsylvania,have invented a new and useful Drill-Grinder, of which the following isa specification.

This invention relates to means for holding a tool with respect to agrindstone during the operation of grinding, and more particularly tothat class known as twist-drill grinders, the object of the inventionbeing to provide a construction in which the drill may be held in properrelation to the grindstone.

In the drawings forming a portion of this specification, and in whichlike numerals of reference designate corresponding parts in both views,Figure 1 is a perspective View showing the holder applied to the frameof a grindstone and the position of a drill held thereby. Fig. 2 is alongitudinal section of a portion of the holder, other portions thereofbeing shown in elevation.

Referring now to the drawings, 5 represents a U-shaped plate, theextremities of the legs 6 of which are fastened upon the upper surfaceof a beam '7 of the grindstone-frame lying at right angles to the planeof movement of the stone and which beam forms an element of the usualstyle of wooden frame. The connected extremities of the legs 6, securedto the grindstone-frame, lie in a common horizontal plane, rearwardly ofwhich the plate is bent upwardly at an angle of substantially fortydegrees, the web of the plate lying in a common plane with theupwardlybent portion of the legs.

The web of the plate 5 has a plurality of perforations 8 therein for theremovable connection of a channel-iron 9, one end of which is bentdownwardly at an angle and is provided with a perforation through whichis passed a bolt 10, adapted to enter one of the perforations 8, and inwhich it is held through the medium of a winged nut 11. By removal ofthis nut the iron 9 may be adjusted both pivotally and transversely ofthe plate 5 to lie at diiferent angles to the plane of rotation of astone 12, rotatably mounted in the frame comprising the beam 7.

Connected to or formed integral with the downwardly-bent end of the iron9, which lies adjacent the stone 12, is a slotted car 13, through whichis passed a clamping-bolt 14, adapted to adjustably hold to said ear aY- shaped rest 14, through a perforation in the stem of which said boltis passed. The converging members of the rest 14 are adapted toconjointly support a drill during the grinding operation.

The rear end of the iron 9 is provided with a longitudinal slot 15,cooperating with which is a similar slot 16 in a slide 17, mountedbetween the upturned edges of the iron 9, and through which slots ispassed a clamping-bolt 18, havinga winged clamping-nut 19, through themedium of which the slide may be clamped in an adjusted position withrespect to the iron 9.

Upon the outer end of the slide 17 is formed or secured a stock 20,having a threaded per foration therein through which is passed a screw21, having a milled adjusting-head 22 at its outer end. The inner end ofthe screw 2l--that is, the end adjacent the stoneis reduced in diameter,as shown at 23, and is screw threaded to receive thecorrespondingly-threaded diminished opening at the rear end of a chuck24 and which latter has in its opposite end a frusto-conical recess 25,terminating at its outer end in a cylindrical extension 26. Thisfrusto-conical recess is adapted to receive pressure of the rear end ofthe stem of a drill when the latter has no center and when the saiddrill is lying in the rest 14, as shown in the drawings. After the drillhas been thus adjusted the rest is adjusted with respect to the car 13to bring the drill into axial alinement with the chuck, and the screw 21is then manipulated to press the cutting edge of the drill intoengagement with the stone and to hold it in this position.

When operating upon a drill which has a center therein, the chuck 24 isremoved and the conical extremity of the diminished portion of the screw21 is brought to lie in said center.

In order that this apparatus may be employed in connection with stonesofdifferent shapes and in order that the drill may be held at differentangles to the plane of rotation of the stone, the adjustable connectionbetween the iron 9 and the plate 5 is provided, and it will be seen thatby manipulation of the adjusting means the drill may be presented toeither the face or the side of a stone, as desired.

It will of course be understood that in practice the proportions of theparts and the material employed will be optional and also that theadjustable connection of the slide 17 with the iron 0 enables theadjustment of the device to receive and operatively hold drills ofdifferent lengths.

Having thus described the invention, what is claimed is 1. A device ofthe class described comprising a U shaped plate adapted for attachmentto the frame of a stone, a channel-iron connected with the plate, achuck carried by the plate and movable with respect thereto, and a restwithin the inclosure of the channeliron and adapted for adjustment withrespect thereto to hold the body in axial alinement with the chuck.

A device of the class described comprising a U-shaped supporting-plateadapted for attachment to a stone-frame, a channel-iron adj ustablyconnected with the plate, a slide mounted within the inclosn re of thechannelment with respect thereto, a stop mounted upon the slide, a screwmounted in the stop and having an operating-wheel, a chuck carried bythe screw and a rest carried by the channel-iron and adapted foradjustment to aline With the chuck.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

ALBERT O. GRUBER.

Witnesses:

CHAS. DINSMORE, E. II. BEsHLIN.

